Because of a large number of data processing to carry out , tms320c5402 dsp , electromagnetic ultrasonic transducer , oscillatory source circuit , receive signal disposal circuit , a / d , sram , flash memory and display circuit are selected to design the prototype of a machine of the real - time measurement system 由于要进行大量的数据处理，硬件电路采用了ti公司的tms320c5402dsp作为核心处理器件，辅以电磁超声换能器、激励源电路、接收信号调理电路、 a d 、 sram 、 flashmemory及显示电路，设计出实时检测系统的样机。
Presents the simple but highly reliable on - line detection of ultrasonic transducer clamping capacitance based on the impedance circuit model constructed through the impedance characteristics of the ultrasonic transducer under triple harmonics , and concludes from experimental results that this method can be used to effectively detect the variation of clamping capacitance while the transducer is operating , and the matching inductance can be dynamically regulated according to the results of detection , and dynamic matching can therefore be achieved in the real sense at the end of the transducer to improve the overall performance of the whole system 为了解决大功率超声应用的换能器电端匹配问题，分析了超声波换能器在谐振频率三次谐波下的阻抗特性，给出了超声换能器三次谐波下的阻抗电路模型.并根据阻抗电路模型建立了对超声换能器的夹持电容实现在线检测简单、可靠性高的方法，实验证明该方法有效的.该方法可以在换能器工作过程中随时检测夹持电容的变化，根据检测结果对匹配电感进行动态调整，实现真正意义上的换能器电端的动态匹配，从而大大改善匹配质量，提高系统的工作性能
The factors include ultrasonic wave frequence , condition temperature , ultrasonic converter instrinisic system error , hareware extended time , electricity noise and sonic noise in the spot , city power defmcient pressure and exceeded pressure , city power peak and pour . we adopt the following compensation schemes of error in the system . about ultrasonic wave frequence ' s effect to measurement precision , we can choose appropriate frequence according to the measured distance 在空气和液压缸中影响测距精度的主要因素包括：超声波的频率、环境温度、超声换能器本身的系统误差(即探头固定误差) 、硬件时间延迟、工作现场的电噪声和声噪声、市电的过压、介压噪声以及市电的尖峰和浪涌噪声，在本系统中采取了以下几种误差的补偿方案： ?对于超声波的频率对测量精度的影响，只能根据测距的距离选择合适的超声频率。
For this reason , referred to the application of electromagnetic ultrasonic in high temperature metal measurement , coarse rail of surface measurement , panel flaw detection and material stress measurement , electromagnetic ultrasonic is introduced into flow measurement for the first time , and electromagnetic ultrasonic transducer is developed to gear to flow measurement . by experiment test , this transducer works normal , thus a new kind of solution for high temperature flow measurement is put forward in the paper 为此，本文借鉴了电磁超声在金属材料的高温检测、粗糙表面钢轨检测、板材探伤和应力测定中的应用，首次将电磁超声引入了流量测量中，并研制了适合流量测量电磁超声换能器，通过实验测试，该换能器能正常工作，从而为高温流体的测量提供了一种新的解决方案。
